I saw that article too and to my surprise it seems that filming and recording albeit with crap equipment is allowed in concert halls nowadays and if the performer objects and the person with the recorder refuses then it is just too bad, the pianist has to play/ refuse to play whilst the person with the apparatus waits patiently to continue. it seems that the hall authorities cannot stop them recording secretly or as in this case, less secretly.
I would really like to know the truth about all this as obviously it could happen to any one of us whether we want it or not. Maybe we can force the person to hand over a sum of cash to record in the hall when we don't particularly want them to, I really don't know.
regards
Brian